package com.ada.apps;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

public class Lunar {
  private int year;
  private int month;
  private int day;
  private boolean leap;
  final static String chineseNumber[] = {"一", "二", "三", "四", "五", "六", "七", "八", "九", "十", "十一", "十二"};
  static SimpleDateFormat chineseDateFormat = new SimpleDateFormat("yyyy年MM月dd日");
  final static long[] lunarInfo = new long[]
    {0x04bd8, 0x04ae0, 0x0a570, 0x054d5, 0x0d260, 0x0d950, 0x16554, 0x056a0, 0x09ad0, 0x055d2,
      0x04ae0, 0x0a5b6, 0x0a4d0, 0x0d250, 0x1d255, 0x0b540, 0x0d6a0, 0x0ada2, 0x095b0, 0x14977,
      0x04970, 0x0a4b0, 0x0b4b5, 0x06a50, 0x06d40, 0x1ab54, 0x02b60, 0x09570, 0x052f2, 0x04970,
      0x06566, 0x0d4a0, 0x0ea50, 0x06e95, 0x05ad0, 0x02b60, 0x186e3, 0x092e0, 0x1c8d7, 0x0c950,
      0x0d4a0, 0x1d8a6, 0x0b550, 0x056a0, 0x1a5b4, 0x025d0, 0x092d0, 0x0d2b2, 0x0a950, 0x0b557,
      0x06ca0, 0x0b550, 0x15355, 0x04da0, 0x0a5d0, 0x14573, 0x052d0, 0x0a9a8, 0x0e950, 0x06aa0,
      0x0aea6, 0x0ab50, 0x04b60, 0x0aae4, 0x0a570, 0x05260, 0x0f263, 0x0d950, 0x05b57, 0x056a0,
      0x096d0, 0x04dd5, 0x04ad0, 0x0a4d0, 0x0d4d4, 0x0d250, 0x0d558, 0x0b540, 0x0b5a0, 0x195a6,
      0x095b0, 0x049b0, 0x0a974, 0x0a4b0, 0x0b27a, 0x06a50, 0x06d40, 0x0af46, 0x0ab60, 0x09570,
      0x04af5, 0x04970, 0x064b0, 0x074a3, 0x0ea50, 0x06b58, 0x055c0, 0x0ab60, 0x096d5, 0x092e0,
      0x0c960, 0x0d954, 0x0d4a0, 0x0da50, 0x07552, 0x056a0, 0x0abb7, 0x025d0, 0x092d0, 0x0cab5,
      0x0a950, 0x0b4a0, 0x0baa4, 0x0ad50, 0x055d9, 0x04ba0, 0x0a5b0, 0x15176, 0x052b0, 0x0a930,
      0x07954, 0x06aa0, 0x0ad50, 0x05b52, 0x04b60, 0x0a6e6, 0x0a4e0, 0x0d260, 0x0ea65, 0x0d530,
      0x05aa0, 0x076a3, 0x096d0, 0x04bd7, 0x04ad0, 0x0a4d0, 0x1d0b6, 0x0d250, 0x0d520, 0x0dd45,
      0x0b5a0, 0x056d0, 0x055b2, 0x049b0, 0x0a577, 0x0a4b0, 0x0aa50, 0x1b255, 0x06d20, 0x0ada0};

  //====== 传回农历 y年的总天数
  final private static int yearDays(int y) {
    int i, sum = 348;
    for (i = 0x8000; i > 0x8; i >>= 1) {
      if ((lunarInfo[y - 1900] & i) != 0) sum += 1;
    }
    return (sum + leapDays(y));
  }

  //====== 传回农历 y年闰月的天数
  final private static int leapDays(int y) {
    if (leapMonth(y) != 0) {
      if ((lunarInfo[y - 1900] & 0x10000) != 0)
        return 30;
      else
        return 29;
    } else
      return 0;
  }

  //====== 传回农历 y年闰哪个月 1-12 , 没闰传回 0
  final private static int leapMonth(int y) {
    return (int) (lunarInfo[y - 1900] & 0xf);
  }

  //====== 传回农历 y年m月的总天数
  final private static int monthDays(int y, int m) {
    if ((lunarInfo[y - 1900] & (0x10000 >> m)) == 0)
      return 29;
    else
      return 30;
  }

  //====== 传回农历 y年的生肖
  final public String animalsYear() {
    final String[] Animals = new String[]{"鼠", "牛", "虎", "兔", "龙", "蛇", "马", "羊", "猴", "鸡", "狗", "猪"};
    return Animals[(year - 4) % 12];
  }

  //====== 传入 月日的offset 传回干支, 0=甲子
  final private static String cyclicalm(int num) {
    final String[] Gan = new String[]{"甲", "乙", "丙", "丁", "戊", "己", "庚", "辛", "壬", "癸"};
    final String[] Zhi = new String[]{"子", "丑", "寅", "卯", "辰", "巳", "午", "未", "申", "酉", "戌", "亥"};
    return (Gan[num % 10] + Zhi[num % 12]);
  }

  //====== 传入 offset 传回干支, 0=甲子
  final public String cyclical() {
    int num = year - 1900 + 36;
    return (cyclicalm(num));
  }

  /**
   * 传出y年m月d日对应的农历.
   * yearCyl3:农历年与1864的相差数 ?
   * monCyl4:从1900年1月31日以来,闰月数
   * dayCyl5:与1900年1月31日相差的天数,再加40 ?
   *
   * @param cal
   * @return
   */
  public Lunar(Calendar cal) {
    int yearCyl, monCyl, dayCyl;
    int leapMonth = 0;
    Date baseDate = null;
    try {
      baseDate = chineseDateFormat.parse("1900年1月31日");
    } catch (ParseException e) {
      e.printStackTrace(); //To change body of catch statement use Options | File Templates.
    }

//求出和1900年1月31日相差的天数
    int offset = (int) ((cal.getTime().getTime() - baseDate.getTime()) / 86400000L);
    dayCyl = offset + 40;
    monCyl = 14;

//用offset减去每农历年的天数
// 计算当天是农历第几天
//i最终结果是农历的年份
//offset是当年的第几天
    int iYear, daysOfYear = 0;
    for (iYear = 1900; iYear < 2050 && offset > 0; iYear++) {
      daysOfYear = yearDays(iYear);
      offset -= daysOfYear;
      monCyl += 12;
    }
    if (offset < 0) {
      offset += daysOfYear;
      iYear--;
      monCyl -= 12;
    }
//农历年份
    year = iYear;

    yearCyl = iYear - 1864;
    leapMonth = leapMonth(iYear); //闰哪个月,1-12
    leap = false;

//用当年的天数offset,逐个减去每月（农历）的天数，求出当天是本月的第几天
    int iMonth, daysOfMonth = 0;
    for (iMonth = 1; iMonth < 13 && offset > 0; iMonth++) {
//闰月
      if (leapMonth > 0 && iMonth == (leapMonth + 1) && !leap) {
        --iMonth;
        leap = true;
        daysOfMonth = leapDays(year);
      } else
        daysOfMonth = monthDays(year, iMonth);

      offset -= daysOfMonth;
//解除闰月
      if (leap && iMonth == (leapMonth + 1)) leap = false;
      if (!leap) monCyl++;
    }
//offset为0时，并且刚才计算的月份是闰月，要校正
    if (offset == 0 && leapMonth > 0 && iMonth == leapMonth + 1) {
      if (leap) {
        leap = false;
      } else {
        leap = true;
        --iMonth;
        --monCyl;
      }
    }
//offset小于0时，也要校正
    if (offset < 0) {
      offset += daysOfMonth;
      --iMonth;
      --monCyl;
    }
    month = iMonth;
    day = offset + 1;
  }

  public static String getChinaDayString(int day) {
    String chineseTen[] = {"初", "十", "廿", "卅"};
    int n = day % 10 == 0 ? 9 : day % 10 - 1;
    if (day > 30)
      return "";
    if (day == 10)
      return "初十";
    else
      return chineseTen[day / 10] + chineseNumber[n];
  }

  public String toString() {
    return year + "年" + (leap ? "闰" : "") + chineseNumber[month - 1] + "月" + getChinaDayString(day);
  }


  public static void main(String[] args) {
    Calendar cal=Calendar.getInstance();
    SimpleDateFormat sdf=new SimpleDateFormat("yyyy年MM月dd日");
    cal.setTimeZone(TimeZone.getDefault());
    System.out.println("公历日期:"+sdf.format(cal.getTime()));
    Lunar lunar=new Lunar(cal);
    System.out.print("农历日期:");
    System.out.print(lunar.year+"年 ");
    System.out.print(lunar.month+"月 ");
    System.out.print(getChinaDayString(lunar.day));
    System.out.println("*************");
    System.out.println(lunar);
  }

    /*
 public static void main(String[] args) throws ParseException {
  Calendar today = Calendar.getInstance();
  today.setTime(chineseDateFormat.parse("2007年11月6日"));
  Lunar lunar = new Lunar(today);
  System.out.println("北京时间：" + chineseDateFormat.format(today.getTime()) + "　农历" + lunar);
   }
    */
}
